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BRUEL & KJAER 2204 - Page 43

BRUEL & KJAER 2204
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,_,
__
Fo.q.Scolto.
_oo
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:.
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4
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15
A I C
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f61699
Fig. 6.5. Frequency response
of
the
instrument
with
microphone
Type
4191.
Investigations
have
been
carried
out
in
order
to
determine
the
influence
of
sound
wave
reflections
from
instrument
housings
of
different
shapes,
and
also
from
a
person
standing
behind
the
instrument.
Fig. 6.5
shows
the
response
of
the
Sound
Level Meter
with
no
disturbing
obstacles
nearby.
The
slight
irregularities
that
appear
on
the
curve
are
due
to
reflections
from
the
knobs
and
meter
housing.
Anomalies
due
to
reflections
from
the
operator
are
usually
most
marked
in
the
frequency
range
200
to
4ooo
Hz.
Errors
in
the
order
of
2-3
dB
may
easily
result,
and
around
400
Hz
more
than
10
dB
may
be
experienced. (An excellent
treatment
of
this
rather
complicated
subject
of
reflections
has
been
published
by
R.
W.
Young
in
the
journal
"Sound",
Vol. 1, 1962,
page
17.)
Whether
the
presence
of
the
operator
has
any
influence
on
the
sound
level
reading
or
not
can
be
detected
by
changing
the
relative
position
of
the
Extension
Connector
163721
Fig.
6.
6.
Sound
Level Meter
with
Extension
Connector.
41

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